Nace releases four open Drex decision models that return a probability for every option

Nace.AI published a technical report on Drex, a family of four open decision models. Instead of generating text and parsing an answer, a decision model takes a context, a question, and options, and one forward pass returns a probability for every option. Flagship Drex Max scores 67.52 on the Decision Index 0.4.1 public suite versus 60.70 for Jev 1.14.0, and drops less than a point when private tests are added. On Decision Bench v4 with raw image input it is statistically tied with d3-turbo and GPT-6 Sol, answering a typical request in about 183 ms. Weights and inference code for all four models are open, and Drex Max is served through the Drex API.

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